As more details emerge on former President Joe Biden‘s mental and physical state while in office, President Donald Trump and his allies have seized on the autopen in their attacks on Trump’s predecessor.

Biden, 82, has faced a whirlwind of public scrutiny, with new reporting and books, such as CNN anchor Jake Tapper and Axios reporter Alex Thompson’s Original Sin, suggesting that Biden was not fit to serve a second term — and that his inner circle knew it. Biden has pushed back on those claims, saying: “I made the decisions about the pardons, executive orders, legislation, and proclamations. Any suggestion that I didn’t is ridiculous and false.”